Brush-holder.



Patented Dec. l7, I90I. W. E. BAKER,

BBUSI-I.HOLDEB.

(Application filed Aug. 26, 1899.)

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(No Model.)

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BRUSH HOLDER.

ic'ation filed Aug. 25 1899 (No Model.) 2 Sheets- Sheet 2.

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. UNITED STATES PATENT OFFICE.

WILLIAM E. BAKER, OF NEW YORK N. Y. ASSIGNOR TO THE GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

BRUSH -HOLDER.

SPECIFICATION forming a. of Letters Patent No. 688,817, dated December 17, 1901. Application filed August 25, 1899. $erial No. 728,450. (No model.

useful Improvements inBrush-Holders, (Case No. 1,277,) of which the following is a specification.

This invention relates to brush-holders for dynamo-electric machines or electric motors, and is particularly adapted for use with railway-motors.

The object of the invention is to provide a carbon-holding device having a maximum current-carrying capacity,so as to avoid the effects of heating between the carbon brush and its support, to prevent jarring loose of the support by which the holder is connected to the motor, and to provide for incasing the spring and other parts which may work loose in service, so as to prevent injury to the commutator or windings of the motor.

The several features of novelty of the invention will be specifically pointed out hereinafter and will be definitely indicated in the claims. 4 p

In the accompanying drawings, which illustrate my invention, Figure 1 is a side elevation of a pair of commutator-brushes supported in operative relation to the commutator of an electric motor. Fig. 2 is aplan view Fig. 3 is an end View of the brush-holder, and Fig. 4 is a perspec tive view of a form of brush-holder modified with respect to the arrangement of the securing means 12.

Referring to Fig. 4, 1, 2, and 3 represent a plurality of brush-arms cast of brass or bronze and provided at the free end with a socket or guide 4, 5, 6 for carbon brushes. The front end of the socket is provided with a circular opening terminating on the outer side in a ring 7 8 9, threaded on its inner face. This opening is made as large as possible considering the width of the brush-opening and accommodates a nut, as 10, (see Fig. 2,) which is cast hollow with a square or rectangular countersunk hole, as indicated in Figs. 2 and I 3, into which may be inserted a wrench for tightening the nut against the brush to make good contact between the two and permitting the latter to be set with relation to the comm utator. This organization permits the brushholding devices to be made very strong without great weight and prevents any large inertia and resulting jumping under the vibrations of the motor or truck on which it is mounted. The rear end of each brush-arm has an integral hollow sleeve 20, whereby the arm ispivotally mounted on a pin 18 in a cast brass or bronze case 11, integral with which is a slotted supporting-arm 12, provided with a symmetrically serrated or indented face adapted to be placed in opera-' tive relation to a similarly-indented part fixed to the motor. The casing 11 separates the springs and pivots from the commutator, and hence prevents commutator-dust from interfering with their proper working, as well as prevents damage to the commutator or windings of the machine in case the springs become detached. The symmetrical indenta tions permit adjustment of the brush-holders and'case toward the commutator, and when the nut 13, as indicated in Fig. 1, is tightened similar lug 15, cast integral with the brushholder case 11, is inserted a very stifi spring 16, which in assembling the parts is brought into a state of compression and gives a strong downward thrust upon the outer end of the brush-arm, which, with the main part of the arm, acts as a bell-crank lever. The case may be designed to accommodate any des red number of brush-arms. The organization shown in Fig. 4 illustrates three, while that shown in Figs. 1, 2, and 3 illustrates two. 5 Each, as will be understood from the drawings, is provided with an independent spring and is capable of independent movement, thus insuring a better contact of the commutator-bars than it a single movable part were It may be otherwise placed, as 80 provided. The case 11 extends forward beneath the brush-arms and is provided at the sides with upwardly-extending walls which form a housing for the springs and connecting devices and prevent them from dropping against the motor if broken or worked loose. The movable end of each brush-holding arm is connected with the casing by a flexible conducting-cable, as 17, the ends of which enter sockets formed in the brush-arm and easing, respectively, and may be soldered or brazed fast thereto, so that reliance need not be placed on the pivot-piece to carry the current. The front end of the casing is turned up, as indicated in Figs. 1 and 4, and forms a fixed stop for the brush-arms when the brush wears down a determinate amount, thuspreventing contact of the end of the brush-arm with the commutator and resultant damage to the parts. 7

To promote convenience in assembling the parts, a long steel pin 18, provided with a screw-thread at one end and with a square shoulder 19 at the other end, is employed to form a common pivot for the several brushholding arms and after being inserted in place may be screwed home by a Wrench, so as to be firmly connected with the case.

What I claim as new, and desire to secure by Letters Patent of the United States, is-- 1. A brush-holder, which comprises a fixed support, an arm freely movable thereon, a socket for the brush on the arm, a relatively large screw-threaded lateral opening being formed in the socket, and a nut adapted to be screwed into said opening to secure the brush in good contact with the socket.

2. A brush-holder comprising an elastically-yielding brush-arm movable radially with relation to the commutator, a brush movable in a socket in the free end of the arm, and a countersunk clamp device for the brush adapted to receive a ti ghtenin g-key, for the purpose described.

3. A brush-holder, which comprises the following arrangement occupying a very small space: a fixed support, an arm pivoted therein, a brush-socket carried by the arm, a lug on the arm extending downward toward the commutator, and a spring located between the lug on the arm and said socket, and arranged to be compressed against said support at a point between said lug and said socket, whereby the socket is pressed toward the commutator.

4. A brush-holder, which comprises a fixed casing having side walls extending away from the commutator, an arm pivoted in said walls and extending to one side of the casing, a brush-socket on the end of the arm and extending beyond the side of the casing, and means in the casing and thus isolated from the commutator, for forcing the brush-socket toward the commutator.

5. A brush-holder comprising an elastically-movable brush-arm, a fixed support in which said arm is pivoted, a carbon brush in said arm, a clamp-screw engaging the brush over substantially its entire width, and a flexible conductor metallically connected at its ends with the arm and its support.

6. A brush-holder, which comprises a fixed conducting-support, an arm freely movable therein, a socket for the brush on the arm, a relatively large lateral opening being formed in the socket, a nut adapted to be screwed into said opening against the brush in the socket, and a flexible conductor connecting the socket and the support.

7. A brush-holder, comprising a brush-arm pivotally supported in a fixed frame, the fixed frame, a spring between the arm and the frame, a casing under the spring and'arm, and a stop on the casing to arrest thearm when the brush needs adjustment.

8. A brush-holder, which comprises a common pivot support, a plurality of hollow sleeves mounted thereon, a plurality of arms connected with the sleeves, a brush-socket carried by each arm, and a casing between the commutator and said brush-holder parts,-

in which casing the pivot-support is mounted.

9. A brush-holder, which comprises a fixed casing arranged to lie adjacent to the commutator and protect the parts of the holder, an arm pivoted in the casing, a brush-guide at the free end of the arm, a lug on the arm extending toward the casing, and a spring located between the lug on the arm and said brush-guide, and arranged to be compressed against said casing at a point between said lug and said guide, whereby the socket is pressed toward the commutator.

10. A brush-socket which is formed with a screw-threaded lateral opening, in combination with a nut which is adapted to be screwed into said opening against the brush in the socket.

11. A brush-socket having a lateral open ing, an interior screw-threaded ring or flange extending therefrom, in combination with a nut adapted to be screwed through the ring into the. interior of the socket against the brush.

12. The combination with a fixed support, of a brush-arm movably mounted thereon, a spring for forcing the brush toward the com= mutator, and a barrier between the arm and spring, and the commutator, which barrier extends from the support to the end of the arm.

13. The combination with a casing having Walls perpendicular to the commutator, of a pivot-support mounted in said walls, a hollow sleeve mounted on the pivot-support, an arm connected with the sleeve and extending to the side of the casing, and means on the free end of the arm for carrying a brush.

14. The combination with a fixed casing, of

an arm pivoted therein and extending only to the side of the casing, abrush-socket carried by the arm and extending beyond the side of the casing, alug on the arm extending down ward from the commutator, a lag extending arm froln f urthe'r movement toward the com- 10 upward from the casing between the other mutator when the brush needs adjusting.

lug and the brush-socket, and an extension- In witness whereof I have hereunto setmy spring between said lugs isolated by the Gas hand this 22d day of August, 1899. 5 mg mm the Qmnnmmor- I WILLIAM E. BAKER. [L. s.]

15. The combination with a fixed casing having side walls, of a brush-arm pivoted in the casing and thus isolated from the commutator, one wall of which easing prevents the Witnesses:

EZRA A. TUTTLE, OHARLEs N. FLINT. 

